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Cannot build MockMvc (already an X type mapping handler)

I have a simple controller class:

@Controller public class UserController { @RequestMapping("/user") @ResponseBody @PostAuthorize("hasPermission(returnObject, 'VIEW')") public User getUser(Long id) { // fetch user from DB } }

I want to integrate-test my controllers with Spring Security. Based on this article, I created the following test:

 @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(loader = AnnotationConfigWebContextLoader.class, classes = WebappConfig.class) @WebAppConfiguration public class UserControllerTest { @Autowired private WebApplicationContext context; @Autowired private Filter springSecurityFilterChain; protected MockMvc mvc; @Before public void initializeMvc() { mvc = MockMvcBuilders .webAppContextSetup(context) .addFilters(springSecurityFilterChain) .build(); } // tests }

However, inside the @Before method, when build() is called, the following exception is thrown:

 java.lang.IllegalStateException: Cannot map handler 'userController' to URL path [/user]: There is already handler of type [class com.example.UserController$$EnhancerBySpringCGLIB$$adfe5ea8] mapped.

It seems like Spring is trying to instantiate the controller twice. Why?

Webapp configuration:

 @Configuration @EnableWebMvc @ComponentScan("com.example") @EnableGlobalMethodSecurity(prePostEnabled = true) @EnableSpringDataWebSupport public class WebappConfig extends WebMvcConfigurerAdapter { }

Full stack trace:

 org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping': Initialization of bean failed; nested exception is java.lang.IllegalStateException: Cannot map handler 'userController' to URL path [/user]: There is already handler of type [class com.example.rest.controller.UserController$$EnhancerBySpringCGLIB$$adfe5ea8] mapped. at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:547) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:291) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.createDefaultStrategy(DispatcherServlet.java:849) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.getDefaultStrategies(DispatcherServlet.java:818) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.initHandlerMappings(DispatcherServlet.java:588) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.initStrategies(DispatcherServlet.java:482) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.web.servlet.DispatcherServlet.onRefresh(DispatcherServlet.java:471) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:555) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) [spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] at javax.servlet.GenericServlet.init(GenericServlet.java:244) [javax.servlet-api-3.1.0.jar:3.1.0] at org.springframework.test.web.servlet.MockMvcBuilderSupport.createMockMvc(MockMvcBuilderSupport.java:52) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.test.web.servlet.setup.AbstractMockMvcBuilder.build(AbstractMockMvcBuilder.java:146) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE] at com.example.UserControllerTest.initializeMvc(UserControllerTest .java:40) [test/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_45] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_45] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_45] at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_45] at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) [junit-4.12.jar:4.12] at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit-4.12.jar:4.12] at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) [junit-4.12.jar:4.12] at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) [junit-4.12.jar:4.12] at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) [junit-4.12.jar:4.12] at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:73) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55) [junit-4.12.jar:4.12] at org.junit.rules.TestWatcher$1.evaluate(TestWatcher.java:55) [junit-4.12.jar:4.12] at org.junit.rules.RunRules.evaluate(RunRules.java:20) [junit-4.12.jar:4.12] at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:73) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) [junit-4.12.jar:4.12] at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:224) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:83) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) [junit-4.12.jar:4.12] at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) [junit-4.12.jar:4.12] at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) [junit-4.12.jar:4.12] at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) [junit-4.12.jar:4.12] at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) [junit-4.12.jar:4.12] at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:68) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit-4.12.jar:4.12] at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:163) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.junit.runner.JUnitCore.run(JUnitCore.java:137) [junit-4.12.jar:4.12] at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:78) [junit-rt.jar:na] at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:212) [junit-rt.jar:na] at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68) [junit-rt.jar:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_45] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_45] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_45] at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_45] at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140) [idea_rt.jar:na] Caused by: java.lang.IllegalStateException: Cannot map handler 'userController' to URL path [/user]: There is already handler of type [class com.example.rest.controller.UserController$$EnhancerBySpringCGLIB$$adfe5ea8] mapped. at org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:295) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.web.servlet.handler.AbstractUrlHandlerMapping.registerHandler(AbstractUrlHandlerMapping.java:265) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.web.servlet.handler.AbstractDetectingUrlHandlerMapping.detectHandlers(AbstractDetectingUrlHandlerMapping.java:82) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.web.servlet.handler.AbstractDetectingUrlHandlerMapping.initApplicationContext(AbstractDetectingUrlHandlerMapping.java:58) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.context.support.ApplicationObjectSupport.initApplicationContext(ApplicationObjectSupport.java:120) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.web.context.support.WebApplicationObjectSupport.initApplicationContext(WebApplicationObjectSupport.java:76) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.context.support.ApplicationObjectSupport.setApplicationContext(ApplicationObjectSupport.java:74) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.context.support.ApplicationContextAwareProcessor.invokeAwareInterfaces(ApplicationContextAwareProcessor.java:119) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.context.support.ApplicationContextAwareProcessor.postProcessBeforeInitialization(ApplicationContextAwareProcessor.java:94) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:408) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1566) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE] ... 51 common frames omitted

I can run this test in the stand-alone configuration of MockMvc, but it seems like I cannot use Spring's web data integration , which is equally annoying.

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2 answers

This is an assumption because you do not provide other parts of the system that may seem unrelated, but in fact they can be caused by the @ComponentScan ("com.example") annotation of the WebappConfig class. This is usually the most common reason in my experience.

If you have other @Configuration classes in the package "com.example" or any of its subpackages, they will also be loaded into the Context.

Now, if the other @Configuration classes also have the @ComponentScan annotation, this will probably be the problem of checking the components twice.

So, if this is your case, the solution to avoiding this scenario is to organize your packages so that classes using @ComponentScan annotations never look at other classes that also use @ComponentScan.

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Try not to scan the name com.project. *, in general, this is bad practice, which can lead to problematic initialization of the bean, not only because, upon startup errors, it can also lead to the loading of beans, which should not be part of your current context.

Try using the correct package naming standards and only scan services, components, and repository packages ... once.

 @Configuration @EnableWebMvc @EnableGlobalMethodSecurity(prePostEnabled = true) @EnableSpringDataWebSupport @Import(value = ComponentScanConfig.class) public class WebappConfig extends WebMvcConfigurerAdapter { }

Component Scan Configuration File:

 @Configuration @ComponentScan(basePackages = { "com.example.serviceModule.service", "com.example.webModule.controller" }) public class ComponentScanConfig { }
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Source: https://habr.com/ru/post/972404/

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